Dizzy O-Ringy Thingy
Thread Starter
|
Tuned
Joined: Apr 2012
Posts: 253
Likes: 0
From: Winter, WI
Dizzy O-Ringy Thingy
I've been going through the catalogs and I have been Googling until I turn blue in the face but I just can't find a exact replacement o-ring for my 1978 F150 300 with a Duraspark II distributor. I've been working on oil leaks since I got the truck and now it's down to this and the rear seal. Thanks for any ideas!
Thread Starter
|
Tuned
Joined: Apr 2012
Posts: 253
Likes: 0
From: Winter, WI
There was someone here on FTE who tried a couple of different rings with no luck sealing it or he couldn't get the dizzy back in. He Mic'd the groove and was going to order one from a o-ring manufacturer. I have to try and find him and see if knows which o-ring he used. Ttyl
Cross-Country
Joined: Mar 2008
Posts: 97
Likes: 9
From: KS
You should be able to take the old 0-ring into the parts store and match it up with one. Most part stores have a box that has various sized o-rings behind the counter that you can match up. If the old o-ring is too broken to be able to match the size, then take your distributor in and match it up that way. The good thing about o-rings is that it doesn't have to be the exact size to work properly.
What you would be looking for is one thick enough to fit the groove, be snug on the housing, and extend beyond the housing probably no more than 1/32". That way it will seal, but not be too thick that it gets cut during installation. The o-rings are cheap enough that you can take a couple of different sizes with you without costing allot (they're usually $.35-.50 each). Also you will want to use some oil or light film of grease to aid in installation.
What you would be looking for is one thick enough to fit the groove, be snug on the housing, and extend beyond the housing probably no more than 1/32". That way it will seal, but not be too thick that it gets cut during installation. The o-rings are cheap enough that you can take a couple of different sizes with you without costing allot (they're usually $.35-.50 each). Also you will want to use some oil or light film of grease to aid in installation.
Senior User
Joined: Nov 2004
Posts: 224
Likes: 0
From: texas,earth
according to Napa & Oreilly websites, 5511 Fel Pro is the o-ring you seek. Haven't played with a 6 in a row for a while, don't remember if its an "o" ring, or a tapered rubber seal from the factory...
just my .02
just my .02
Trending Topics
Post Fiend
Joined: Apr 2008
Posts: 8,261
Likes: 15
From: Big Sky Country
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Thread Starter
|
Tuned
Joined: Apr 2012
Posts: 253
Likes: 0
From: Winter, WI
I had seen that 5511 O-ring before in my searching but I thought it said was for the V8s only. A distributor hole should be the same for I6's or V8's...? Ill call my local Napa and talk to them about it.
As far as going to Car Quest or Napa and looking through their kits, they tend to not restock the commons sizes. Been there. And where I live you have to hit the long road just to get to the two stores and if you want more stores it'll be a really long drive. Thanks all for the help! BTW, Is Number Dummy still around? I ain't seen him on here lately.
As far as going to Car Quest or Napa and looking through their kits, they tend to not restock the commons sizes. Been there. And where I live you have to hit the long road just to get to the two stores and if you want more stores it'll be a really long drive. Thanks all for the help! BTW, Is Number Dummy still around? I ain't seen him on here lately.
Last edited by hermancm; Jul 7, 2013 at 10:12 PM. Reason: Spelling
Mountain Pass
Joined: Sep 2007
Posts: 164
Likes: 1
From: NW Ohio
I'm in the exact same situation, so I went and picked up the 5511. Maybe someone packaged the wrong o-ring, but there is no way it fits the 300 dizzy.
The parts stores list it for the 300, but Fel-Pro's site only lists it for v8s.
The one I got is way too big.
I got out my digital caliper and this is what I measured: dizzy groove - 1.15", o-ring inner dia. - 1.14", o-ring outer dia. - 1.45", o-ring width - .15". The cross section is almost square.
In checking industrial o-ring suppliers and manufacturers, no one has an off the shelf replacement. Perhaps we could do a group buy, as some of these companies will custom make whatever is needed, but typically require a certain quantity to be ordered. They will even reverse engineer an original to ensure exact fitment.
What I don't understand is how they are supplied in the master kits, but not individually. Somebody somewhere must make them.
The parts stores list it for the 300, but Fel-Pro's site only lists it for v8s.
The one I got is way too big.
I got out my digital caliper and this is what I measured: dizzy groove - 1.15", o-ring inner dia. - 1.14", o-ring outer dia. - 1.45", o-ring width - .15". The cross section is almost square.
In checking industrial o-ring suppliers and manufacturers, no one has an off the shelf replacement. Perhaps we could do a group buy, as some of these companies will custom make whatever is needed, but typically require a certain quantity to be ordered. They will even reverse engineer an original to ensure exact fitment.
What I don't understand is how they are supplied in the master kits, but not individually. Somebody somewhere must make them.
Thread
Thread Starter
Forum
Replies
Last Post
BIGJOHN1970
1973 - 1979 F-100 & Larger F-Series Trucks
3
Jan 9, 2016 11:54 AM
hermancm
1973 - 1979 F-100 & Larger F-Series Trucks
2
May 16, 2012 10:29 AM
HarryPutnam
1973 - 1979 F-100 & Larger F-Series Trucks
4
May 21, 2011 07:26 PM
